Carrier introduces the 19XR Evergreen centrifugal compressor chiller. This chiller has won four energy efficiency and environmental awards in 2 years.
For the first time, there is no need to choose between high energy efficiency and environmental friendliness or between low operating cost and long-term refrigerant availability in air conditioning systems.
А mathematical model for the on-line control of the implementation of scientific-technical and innovation projects in the branches of agriindustrial complex is a set of linear limitations which describe all possible reasonable requirements arising during solution of the problem being considered.
For the solution of this multi-criterion problem the method is offered which is based on «convolution» of the vector criterion into the single, generalized one.
Three methods of the convolution of criteria are offered (depending on the approach to the distribution of the dedicated limited means) and their formalized description are offered.
In all the cases considered the distribution of financial means is reduced to the problem of linear programming. It is shown that for the branches of agriindustrial complex the dimension of the corresponding problems of linear programming is quite moderate.
А technique for the calculation of compound refrigerating installations with three and four evaporating temperatures has been proposed. Dependencies are given for the determination of the mass flow rate in the components of installations according to which one can calculate their characteristics.
In Russia, the majority of refrigeration systems in the food industry use ammonia-based refrigeration systems, which for a number of reasons cannot be replaced.
Since the average service life of such systems is practically exhausted, most of them require replacement of failed elements, such as condensers, evaporators, shutoff valves, automation.
Moreover, availability of emergency-hazardous systems with large volume of ammonia creates the threat of emergency situations. At present at the market there are refrigeration equipment of many leading foreign and domestic manufacturers on the basis of which there is an opportunity to realize optimal solutions during reconstruction of systems. At the same time Alfa Laval offers the widest range of unique heat-exchange equipment for ammonia refrigeration in Russia, which provides a high level of technology.
The company's partners have achieved significant success in implementing comprehensive re-equipment projects for large ammonia systems almost all over Russia.
Ecologically pure low-temperature coolants have been considered: calcium chloride and ethyl alcohol solutions. Their comparative characteristics are presented: dependence of freezing temperature of the solution from concentration and viscosity from temperature. Aqueous-alcohol coolants of the mark «Ecofrost» are described in more detail.
Cryotech designs, assembles and supplies flake ice machines with GENEGLACE drum-type ice makers. GENEGLACE is one of the leaders in the development and production of ice machines - a part of the GEA-GRASSO Group.
Güntner (Germany) has been a leader in the global market of heat exchange equipment for many years. The specialists of TermoKool Group install Güntner equipment at poultry, meat and seafood storage and processing facilities such as Metatr fish processing complex (Korolev), Bogatyr sausage factory (Moscow), poultry processing complex (Tula region) by order of Mosselprom and others.
Refrigerating stations for obtaining ice water in ice storage tanks with bulk ice were described in the article "Features of obtaining ice water using bulk ice accumulators", published in the journal "Refrigeration Engineering" No. 5/2003. The first plant of this type in Russia was designed and put into operation at the Nizhnekamsk Dairy Plant by FABS Engineering.
AirCool consistently introduces new technologies in the field of remote monitoring and control systems for refrigeration and technological equipment.
The main objects of such control are large and medium-sized food enterprises equipped with fast-freezing equipment, water-cooling units, freezers and warehouses of finished products. The objects where the implementation of such systems is most effective should also include large automated warehouses for storing various types of products and supermarkets.
There are several dozens of refrigeration companies active in the Russian refrigeration market, each of which occupies its own segment - assembly production of refrigeration equipment, supply of process refrigeration equipment, distribution or engineering. Frigotechnika positions itself in this market both as a distributor and as an engineering company, working both with final customers and with regional installers.
The long-term experience of the company personnel in working with foreign refrigeration equipment, well-thought-out logistics of supplies, competent price policy - all this allows the company not only actively cooperate with its regular clients, but also expand their number at the expense of regional installing organizations and enterprises - final consumers of refrigeration. The presented information describes the main services and range of refrigeration equipment offered by Frigotechnika.
One of the main reasons of unstable operation of ATKA-545- 5000 turbochargers is the approach of the operating mode to the zone of the second critical revolutions. In order to eliminate the shortcomings revealed in the process of operation, in the 90's the manufacturer began to reconstruct the compressors with the introduction of multi wedge bearings.
General information about composition, main characteristics, advantages and range of application of ecologically safe coolants "Ecosol" produced by Fornell were presented in article "Ecologically safe antifreeze "Ecosol" published in magazine "Refrigeration engineering" 4/2003. In more detail the thermophysical properties of ecosols in a wide range of temperatures are given in this article.
April 20, 2003, Alexei Borisovich Grachev, candidate of technical sciences, associate professor, passed away.